MRPL18

gene
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Also known as HSPC071uL18m

Summary

MRPL18 (mitochondrial ribosomal protein L18, HGNC:14477) is a protein-coding gene on chromosome 6q25.3, encoding Large ribosomal subunit protein uL18m (Q9H0U6). Together with thiosulfate sulfurtransferase (TST), acts as a mitochondrial import factor for the cytosolic 5S rRNA. It is a selective cancer dependency (DepMap: 52.2% of cell lines).

This nuclear gene encodes a protein component of the larger 39S subunit of mitochondrial ribosome. This protein may also aid in the import of nuclear-encoded 5S rRNA into mitochondria. Alternative splicing results in multiple transcript variants, most of which are not predicted to encode a protein. A pseudogene of this gene is found on chromosome 16.

Source: NCBI Gene 29074 — RefSeq curated summary.

At a glance

  • Clinical variants (ClinVar): 38 total — 1 pathogenic
  • Cancer dependency (DepMap): dependent in 52.2% of screened cell lines
  • MANE Select transcript: NM_014161

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:14477
Approved symbolMRPL18
Namemitochondrial ribosomal protein L18
Location6q25.3
Locus typegene with protein product
StatusApproved
AliasesHSPC071, uL18m
Ensembl geneENSG00000112110
Ensembl biotypeprotein_coding
OMIM611831
Entrez29074

Gene structure

Transcript identifiers

Ensembl transcripts: 6 — 3 protein_coding, 3 protein_coding_CDS_not_defined

ENST00000367034, ENST00000476826, ENST00000479638, ENST00000480842, ENST00000857674, ENST00000953331

RefSeq mRNA: 2 — MANE Select: NM_014161 NM_001318817, NM_014161

CCDS: CCDS5270

Canonical transcript exons

ENST00000367034 — 4 exons

ExonStartEnd
ENSE00001443299159790467159790639
ENSE00003649410159798052159798429
ENSE00003652170159797287159797518
ENSE00003657521159790940159791126

Expression profiles

Bgee: expression breadth ubiquitous, 287 present calls, max score 99.33.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 60.7445 / max 709.1135, expressed in 1823 samples.

FANTOM5 promoters (8 alternative TSS)

Promoter IDTPM avgSamples expressed
7099741.31431820
709938.77881779
709953.90101315
709962.07861307
709902.04311028
709911.2219759
709921.0676789
709940.3390149

Top tissues by expression

288 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
oocyteCL:000002399.33gold quality
secondary oocyteCL:000065598.63gold quality
olfactory bulbUBERON:000226496.61gold quality
palpebral conjunctivaUBERON:000181296.50gold quality
adult organismUBERON:000702396.39gold quality
hindlimb stylopod muscleUBERON:000425296.32gold quality
adrenal tissueUBERON:001830396.20gold quality
cingulate cortexUBERON:000302796.11gold quality
anterior cingulate cortexUBERON:000983596.11gold quality
mucosa of transverse colonUBERON:000499195.98gold quality
smooth muscle tissueUBERON:000113595.93gold quality
prefrontal cortexUBERON:000045195.87gold quality
C1 segment of cervical spinal cordUBERON:000646995.84gold quality
type B pancreatic cellCL:000016995.83gold quality
rectumUBERON:000105295.65gold quality
amygdalaUBERON:000187695.65gold quality
mucosa of sigmoid colonUBERON:000499395.65gold quality
caudate nucleusUBERON:000187395.64gold quality
gingivaUBERON:000182895.61gold quality
muscle layer of sigmoid colonUBERON:003580595.57gold quality
olfactory segment of nasal mucosaUBERON:000538695.55gold quality
Brodmann (1909) area 9UBERON:001354095.55gold quality
right adrenal glandUBERON:000123395.51gold quality
popliteal arteryUBERON:000225095.47gold quality
colonic mucosaUBERON:000031795.46gold quality
tibial arteryUBERON:000761095.46gold quality
epithelium of nasopharynxUBERON:000195195.45gold quality
right coronary arteryUBERON:000162595.42gold quality
dorsolateral prefrontal cortexUBERON:000983495.41gold quality
islet of LangerhansUBERON:000000695.38gold quality

Single-cell (SCXA)

Detected in 2 experiment(s), a significant marker in 1.

ExperimentMarker?Max mean expression
E-MTAB-10137no668.16
E-ANND-3no0.00

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

14 targeting MRPL18, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-627-3P99.9071.423316
HSA-MIR-3140-3P99.8868.472069
HSA-MIR-137-3P99.8774.742401
HSA-MIR-366099.6867.331149
HSA-MIR-486-3P99.5166.821901
HSA-MIR-4687-3P99.4866.41968
HSA-MIR-4666A-5P99.4169.721887
HSA-MIR-130A-5P99.3370.262623
HSA-MIR-324-3P99.2666.311034
HSA-MIR-5584-3P99.2368.791351
HSA-MIR-1537-5P98.7068.33999
HSA-MIR-532-5P98.4367.53760
HSA-MIR-6509-3P98.3267.331343
HSA-MIR-4772-3P98.0465.601203

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 52.2% of screened cell lines.

Cross-species orthologs

5 orthologs

OrganismSymbolGene ID
danio_reriomrpl18ENSDARG00000060199
mus_musculusMrpl18ENSMUSG00000057388
rattus_norvegicusMrpl18ENSRNOG00000014582
drosophila_melanogastermRpL18FBGN0026741
caenorhabditis_elegansWBGENE00017044

Protein

Protein identifiers

Large ribosomal subunit protein uL18mQ9H0U6 (reviewed: Q9H0U6)

Alternative names: 39S ribosomal protein L18, mitochondrial

All UniProt accessions (1): Q9H0U6

UniProt curated annotations — full annotation on UniProt →

Function. Together with thiosulfate sulfurtransferase (TST), acts as a mitochondrial import factor for the cytosolic 5S rRNA. The precursor form shows RNA chaperone activity; is able to fold the 5S rRNA into an import-competent conformation that is recognized by rhodanese (TST). Both the cytoplasmic and mitochondrial forms are able to bind to the helix IV-loop D in the gamma domain of the 5S rRNA.

Subunit / interactions. Component of the mitochondrial large ribosomal subunit (mt-LSU). Mature mammalian 55S mitochondrial ribosomes consist of a small (28S) and a large (39S) subunit. The 28S small subunit contains a 12S ribosomal RNA (12S mt-rRNA) and 30 different proteins. The 39S large subunit contains a 16S rRNA (16S mt-rRNA), a copy of mitochondrial valine transfer RNA (mt-tRNA(Val)), which plays an integral structural role, and 52 different proteins.

Subcellular location. Mitochondrion.

Similarity. Belongs to the universal ribosomal protein uL18 family.

RefSeq proteins (2): NP_001305746, NP_054880* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR005484Ribosomal_uL18_bac/plant/animFamily
IPR036967Ribosomal_uS11_sfHomologous_superfamily
IPR057268Ribosomal_L18Family

Pfam: PF00861

UniProt features (19 total): strand 8, helix 7, transit peptide 1, chain 1, sequence variant 1, sequence conflict 1

Structure

Experimental structures (PDB)

75 structures, top 30 by resolution.

PDBMethodResolution (Å)
7OF0ELECTRON MICROSCOPY2.2
7QI4ELECTRON MICROSCOPY2.21
8RRIELECTRON MICROSCOPY2.4
8QU5ELECTRON MICROSCOPY2.42
9OLFELECTRON MICROSCOPY2.46
7OF7ELECTRON MICROSCOPY2.5
7PO4ELECTRON MICROSCOPY2.56
6ZM6ELECTRON MICROSCOPY2.59
7OF6ELECTRON MICROSCOPY2.6
9CN3ELECTRON MICROSCOPY2.62
7QI5ELECTRON MICROSCOPY2.63
7OF2ELECTRON MICROSCOPY2.7
7OF3ELECTRON MICROSCOPY2.7
7OF4ELECTRON MICROSCOPY2.7
8QU1ELECTRON MICROSCOPY2.74
9PR4ELECTRON MICROSCOPY2.77
9PRAELECTRON MICROSCOPY2.83
8ANYELECTRON MICROSCOPY2.85
6ZM5ELECTRON MICROSCOPY2.89
7QH7ELECTRON MICROSCOPY2.89
7ODRELECTRON MICROSCOPY2.9
7OF5ELECTRON MICROSCOPY2.9
8K2AELECTRON MICROSCOPY2.9
8OITELECTRON MICROSCOPY2.9
9PGLELECTRON MICROSCOPY2.9
9PGFELECTRON MICROSCOPY2.93
7QI6ELECTRON MICROSCOPY2.98
9PSMELECTRON MICROSCOPY2.98
8QSJELECTRON MICROSCOPY3
9UWHELECTRON MICROSCOPY3

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q9H0U6-F186.860.75

Function

Pathways and Gene Ontology

Reactome pathways

11 pathways

IDPathway
R-HSA-5368286Mitochondrial translation initiation
R-HSA-5389840Mitochondrial translation elongation
R-HSA-5419276Mitochondrial translation termination
R-HSA-9937383Mitochondrial ribosome-associated quality control
R-HSA-3371453Regulation of HSF1-mediated heat shock response
R-HSA-3371511HSF1 activation
R-HSA-3371568Attenuation phase
R-HSA-3371571HSF1-dependent transactivation
R-HSA-392499Metabolism of proteins
R-HSA-5368287Mitochondrial translation
R-HSA-72766Translation

MSigDB gene sets: 185 (showing top): MODULE_255, PAL_PRMT5_TARGETS_UP, GOBP_MITOCHONDRIAL_TRANSLATION, MODULE_317, GOLDRATH_ANTIGEN_RESPONSE, GOBP_TRANSLATION, WEI_MYCN_TARGETS_WITH_E_BOX, chr6q25, E2F_Q3, GOMF_STRUCTURAL_CONSTITUENT_OF_RIBOSOME, GOBP_NUCLEOBASE_CONTAINING_COMPOUND_TRANSPORT, GOCC_MITOCHONDRIAL_ENVELOPE, YAO_TEMPORAL_RESPONSE_TO_PROGESTERONE_CLUSTER_13, ZHOU_INFLAMMATORY_RESPONSE_LIVE_DN, E2F1_Q3

GO Biological Process (3): translation (GO:0006412), mitochondrial translation (GO:0032543), rRNA import into mitochondrion (GO:0035928)

GO Molecular Function (4): structural constituent of ribosome (GO:0003735), 5S rRNA binding (GO:0008097), RNA binding (GO:0003723), protein binding (GO:0005515)

GO Cellular Component (7): obsolete extracellular space (GO:0005615), mitochondrion (GO:0005739), mitochondrial inner membrane (GO:0005743), mitochondrial ribosome (GO:0005761), mitochondrial large ribosomal subunit (GO:0005762), ribosome (GO:0005840), ribonucleoprotein complex (GO:1990904)

Reactome top-level categories

Rollup of top-5 pathways:

CategoryPathways
Mitochondrial translation4
Cellular response to heat stress3
HSF1-dependent transactivation1
Translation1
Metabolism of proteins1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
peptidyltransferase activity1
translational initiation1
translational elongation1
translational termination1
macromolecule biosynthetic process1
protein metabolic process1
protein biosynthetic process1
mitochondrion1
translation1
mitochondrial gene expression1
RNA import into mitochondrion1
rRNA transport1
structural molecule activity1
ribosome1
rRNA binding1
nucleic acid binding1
binding1
cytoplasm1
intracellular membrane-bounded organelle1
organelle inner membrane1
mitochondrial membrane1
organellar ribosome1
mitochondrial matrix1
organellar large ribosomal subunit1
mitochondrial ribosome1
mitochondrial protein-containing complex1
intracellular membraneless organelle1
protein-containing complex1

Protein interactions and networks

STRING

1170 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
MRPL18TSTQ16762580
MRPL18MRPS25P82663523
MRPL18MRPL44Q9H9J2493
MRPL18FAM151BQ6UXP7474
MRPL18ACTN3Q08043423
MRPL18GUCY1A1Q02108396
MRPL18GTF3AQ92664390
MRPL18TIMM10P62072378
MRPL18CABP7Q86V35364
MRPL18RPS9P46781352
MRPL18MYL6P16475329
MRPL18TMEM243Q9BU79328
MRPL18MRPS10P82664325
MRPL18CCSO14618316
MRPL18RPL5P46777305

IntAct

104 interactions, top by confidence:

ABTypeScore
MRPL18MRPL38psi-mi:“MI:0915”(physical association)0.800
MRPL38MRPL18psi-mi:“MI:0915”(physical association)0.800
RPS6RPL4psi-mi:“MI:0914”(association)0.710
YBX1SSBpsi-mi:“MI:0914”(association)0.710
MALSU1NDUFAB1psi-mi:“MI:0914”(association)0.710
MRPS30GTPBP10psi-mi:“MI:0914”(association)0.640
RPL4RPS20psi-mi:“MI:0914”(association)0.620
ERHSNRPD3psi-mi:“MI:0914”(association)0.580
MRPL18LAPTM5psi-mi:“MI:0915”(physical association)0.560
LAPTM5MRPL18psi-mi:“MI:0915”(physical association)0.560
RPL4RPL5psi-mi:“MI:0914”(association)0.530
MRPL50GTPBP10psi-mi:“MI:0914”(association)0.530
MRPL10ZZEF1psi-mi:“MI:0914”(association)0.530
MRPL42GATCpsi-mi:“MI:0914”(association)0.530
MRPL38DUSP14psi-mi:“MI:0914”(association)0.530
MRPL41MRPL3psi-mi:“MI:0914”(association)0.530
MRPL13GTPBP10psi-mi:“MI:0914”(association)0.530
MRPL18GTPBP10psi-mi:“MI:0914”(association)0.530
MRPL23BCKDHApsi-mi:“MI:0914”(association)0.530
MRPL27MRPL33psi-mi:“MI:0914”(association)0.530
NDUFAB1MIEF1psi-mi:“MI:0915”(physical association)0.490
Ybx1MRPS18Bpsi-mi:“MI:0915”(physical association)0.400
Sgo2aGPA33psi-mi:“MI:0914”(association)0.350
APCBBXpsi-mi:“MI:0914”(association)0.350

BioGRID (283): MRPL18 (Affinity Capture-RNA), MRPL18 (Affinity Capture-RNA), MRPL18 (Affinity Capture-MS), MRPL18 (Affinity Capture-MS), MRPL18 (Affinity Capture-MS), MRPL18 (Affinity Capture-MS), MRPL18 (Affinity Capture-MS), MRPL18 (Affinity Capture-MS), MRPL18 (Affinity Capture-MS), ICT1 (Co-fractionation), MRPL13 (Co-fractionation), MRPL17 (Co-fractionation), MRPL18 (Co-fractionation), MRPL18 (Co-fractionation), MRPL18 (Co-fractionation)

ESM2 similar proteins: A2VD95, A5WUX7, B5XAM2, D2HD32, E7EXT2, O75879, P82673, Q08CK1, Q08DT6, Q0V9C9, Q12322, Q13405, Q14197, Q32LB9, Q3T116, Q3UFY8, Q3ZBR7, Q498P2, Q4R380, Q4R5K7, Q5EA71, Q5I0K8, Q5R8X0, Q5U2R4, Q5XIC2, Q5ZI74, Q640B4, Q6PI78, Q7JUX9, Q7SXA9, Q80VP5, Q80X85, Q8BJZ4, Q8K126, Q8K2Y7, Q8R035, Q8VCE1, Q8VEG4, Q9CQ40, Q9H0U6

Diamond homologs: P34378, Q3ZBR7, Q9CQL5, Q9H0U6, A0KRP0, A0Q4J9, A1RED0, A1S234, A1WVA6, A3DA56, A4IZR8, A4WFB2, A4XLR4, A4YBW7, A5IM99, A6WHU4, A7HM36, A7N9U1, A8F4S7, A8GKI1, A9IW06, A9KJH8, A9KWB8, B0JHY8, B1LBM4, B2ITP0, B2SDW9, B4F1K0, B5FG25, B5XNA9, B5YDV9, B8E1E9, B8EBI9, B8F6Q5, B9K8A2, C4Z2U6, C4ZBT4, C5CGI6, P46182, P52863

SIGNOR signaling

1 interactions.

AEffectBMechanism
MRPL18“form complex”“39S mitochondrial large ribosomal subunit”binding

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 116 IntAct physical interaction partners (hypergeometric vs the genome-wide background, BH-FDR, gene-set size 15–500, ranked by fold). A functional readout of the neighbourhood — distinct from this gene’s own memberships above, and biased toward well-studied / hub proteins, so read it as themes rather than proof.

Reactome pathways:

PathwayPartnersFoldFDR
Mitochondrial ribosome-associated quality control3148.2×1e-43
Mitochondrial translation initiation2845.0×2e-38
Mitochondrial translation elongation2845.0×2e-38
Mitochondrial translation2543.5×7e-34
Mitochondrial translation termination2838.9×1e-36
Translation2922.8×9e-31
Peptide chain elongation914.5×4e-07
Viral mRNA Translation914.5×4e-07

GO biological processes:

GO termPartnersFoldFDR
mitochondrial translation2950.9×3e-40
translation2222.8×7e-22
cytoplasmic translation916.8×4e-07
RNA splicing76.2×6e-03

Disease & clinical

Clinical variants and AI predictions

ClinVar

38 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic1
Likely pathogenic0
Uncertain significance28
Likely benign1
Benign0

Top pathogenic / likely-pathogenic (1)

Variant IDHGVSClassification
563245GRCh37/hg19 6q25.3-27(chr6:159844762-170919482)x3Pathogenic

SpliceAI

584 predictions. Top by Δscore:

VariantEffectΔscore
6:159790773:G:GTdonor_gain1.0000
6:159791077:A:Tdonor_gain1.0000
6:159798036:T:Aacceptor_gain1.0000
6:159798044:A:AGacceptor_gain1.0000
6:159798045:A:Gacceptor_gain1.0000
6:159790600:T:TAdonor_gain0.9900
6:159790777:T:Gdonor_gain0.9900
6:159790811:GGCA:Gdonor_gain0.9900
6:159790812:GCA:Gdonor_gain0.9900
6:159791076:G:GTdonor_gain0.9900
6:159791124:CAGGT:Cdonor_loss0.9900
6:159791126:GG:Gdonor_loss0.9900
6:159791127:GTA:Gdonor_loss0.9900
6:159791128:T:Gdonor_loss0.9900
6:159797370:G:GGdonor_gain0.9900
6:159790561:C:Tdonor_gain0.9800
6:159790615:T:TAdonor_gain0.9800
6:159790769:G:GGdonor_gain0.9800
6:159790782:G:GTdonor_gain0.9800
6:159790938:AG:Aacceptor_gain0.9800
6:159790939:GG:Gacceptor_gain0.9800
6:159791111:G:GGdonor_gain0.9800
6:159794885:C:Gdonor_gain0.9800
6:159797344:C:Tdonor_gain0.9800
6:159798050:A:AGacceptor_gain0.9800
6:159798051:G:GGacceptor_gain0.9800
6:159790933:T:Aacceptor_gain0.9700
6:159790937:CAGG:Cacceptor_gain0.9700
6:159790938:AGGG:Aacceptor_gain0.9700
6:159797374:G:GGdonor_gain0.9700

AlphaMissense

1153 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
6:159791116:T:CF77L0.982
6:159791118:C:AF77L0.982
6:159791118:C:GF77L0.982
6:159797462:G:CA139P0.977
6:159797453:T:CC136R0.969
6:159797363:T:CS106P0.960
6:159791029:T:CF48L0.959
6:159791031:C:AF48L0.959
6:159791031:C:GF48L0.959
6:159791043:C:AN52K0.958
6:159791043:C:GN52K0.958
6:159797361:C:AA105D0.955
6:159797455:C:GC136W0.954
6:159797452:A:CR135S0.951
6:159797452:A:TR135S0.951
6:159791052:C:AN55K0.950
6:159791052:C:GN55K0.950
6:159797355:T:AV103D0.950
6:159791079:A:CK64N0.948
6:159791079:A:TK64N0.948
6:159791037:C:AN50K0.947
6:159791037:C:GN50K0.947
6:159797433:G:AG129E0.943
6:159797367:C:TT107I0.936
6:159797289:T:CL81S0.932
6:159791091:G:CW68C0.931
6:159791091:G:TW68C0.931
6:159797451:G:CR135T0.931
6:159791078:A:TK64I0.929
6:159797469:T:CI141T0.929

dbSNP variants (sampled 300 via entrez): RS1000015394 (6:159794782 G>A), RS1000518769 (6:159789892 G>GT), RS1000636122 (6:159796127 A>T), RS1000860197 (6:159790878 G>C), RS1001093275 (6:159796033 C>A), RS1001913909 (6:159791892 A>C,G), RS1001977996 (6:159789687 A>C), RS1002263104 (6:159792179 A>G), RS1002693876 (6:159789081 G>A), RS1002745965 (6:159798571 G>GT), RS1002745988 (6:159788970 G>A,C,T), RS1002972563 (6:159793565 T>C), RS1003311491 (6:159793415 T>C), RS1003576935 (6:159793234 T>C), RS1003654242 (6:159788897 G>A)

Disease associations

OMIM: gene MIM:611831 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

0 total (0 of 0 shown, HPO-id order):

GWAS associations

0 associations (top):

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

CTD chemical–gene interactions

42 total (human), top 30 by PubMed support.

ChemicalActions (top 5)PubMed papers
sodium arseniteaffects expression, increases expression3
Tobacco Smoke Pollutionincreases expression3
bisphenol Adecreases expression, decreases methylation2
Acetaminophendecreases expression, increases expression2
2-methyl-4-isothiazolin-3-oneincreases expression1
beta-lapachonedecreases expression1
arseniteaffects binding, increases reaction1
beta-methylcholineaffects expression1
celastrolincreases expression1
di-n-butylphosphoric acidaffects expression1
chloropicrinincreases expression1
geduninincreases expression1
K 7174decreases expression1
ICG 001increases expression1
licochalcone Bincreases expression1
PCI 5002affects cotreatment, increases expression1
2-amino-7-(4-fluoro-2-(6-methoxypyridin-2-yl)phenyl)-4-methyl-7,8-dihydropyrido(4,3-d)pyrimidin-5(6H)-oneincreases activity, increases expression1
Atrazinedecreases expression1
Benzo(a)pyreneincreases expression1
Bilirubindecreases expression1
Cadmiumincreases abundance, increases expression1
Cisplatinincreases expression1
Copperaffects binding, decreases expression1
Diethylstilbestrolincreases expression1
Disulfiramaffects binding, decreases expression1
Estradiolincreases expression1
Hydrogen Peroxideaffects expression1
Ivermectindecreases expression1
Ketoconazoleincreases expression1
Ribonucleotidesaffects binding1

Clinical trials (associated diseases)

0 trials via MONDO — disease-level, not drug-specific.

No linked Atlas pages yet — the cross-entity mesh grows as the corpus expands.